RD Sharma - Mathematics

Book: RD Sharma - Mathematics

Chapter: 21. Surface Area and Volume of a Sphere

Subject: Mathematics - Class 9th

Q. No. 21 of Exercise 21.2

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21

A hemisphere of lead of radius 7 cm is cast into a right circular cone of height 49 cm. Find the radius of the base.

Volume of a hemisphere = (2/3)πr3


Volume of a right circular cone = (1/3)πr2h


Given, hemisphere of lead of radius 7 cm is cast into a right circular cone of height 49 cm



r2 = 14


r = 3.74 cm


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